<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<meta name="viewport" content="width=device-width, initial-scale=1">
		<title>js的导入方式</title>
	</head>
	<body>
		<div class="container">
			用户名:<input id="username" type="text" name="" id="" value="username" />
		</div>
	</body>
	<script>
		alert("hello");
	</script>
</html>